One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,10)(4,5)(6,7)(8,11)(9,15)(12,13)(14,16)(17,18)(19,25)(20,28)(21,22)(23,27)(24,29)(26,30)(31,32)(33,34,38,39)(35,42,40,36)(37,45,46,41)(43,44,47,48)(2,7)(5,9)(8,10)(13,16)(17,18)(19,25)(20,28)(21,22)(23,27)(24,29)(26,30)(31,32)(34,39)(36,42)(37,46)(43,47) involution — undirected(3,11)(8,10)(12,14)(13,16)(18,22)(23,25)(24,28)(30,31)(33,35,38,40)(34,36,39,42)(37,43,46,47)(41,44,45,48)(1,3)(2,8)(4,14)(5,13)(6,11)(7,10)(9,16)(12,15)(17,18)(19,25)(20,24)(21,22)(23,27)(26,31)(28,29)(30,32)(33,35)(34,36)(37,43)(38,40)(39,42)(41,44)(45,48)(46,47) involution — undirected(1,4)(2,9)(3,12)(5,7)(6,15)(8,13)(10,16)(11,14)(17,19,21,27)(18,23,22,25)(20,26,29,32)(24,30,28,31)(33,36)(34,40)(35,39)(37,44)(38,42)(41,47)(43,45)(46,48)(1,5,6,9)(2,4,7,15)(3,13,11,16)(8,14,10,12)(17,20,21,29)(18,24,22,28)(19,26,27,32)(23,30,25,31)(33,37,38,46)(34,41,39,45)(35,43,40,47)(36,44,42,48)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.