One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,6)(5,8)(9,12)(10,15)(11,13)(14,16)(20,27)(22,29)(23,28)(25,31)(33,34,39,42)(35,43,45,46)(36,44,40,48)(37,41,38,47)(2,6)(4,12)(7,13)(8,9)(11,16)(14,15)(17,18)(19,22)(20,28)(21,24)(23,27)(25,32)(26,29)(30,31)(33,35)(34,40)(36,42)(37,44)(38,48)(39,45)(41,46)(43,47) involution — undirected(1,3)(2,7)(4,11)(5,10)(6,13)(8,15)(9,14)(12,16)(17,19)(18,22)(20,25)(21,26)(23,30)(24,29)(27,31)(28,32)(33,36,39,40)(34,35,42,45)(37,46,38,43)(41,48,47,44)(2,8)(3,10)(6,9)(11,16)(17,20,21,27)(18,23,24,28)(19,25,26,31)(22,30,29,32)(33,37,39,38)(34,41,42,47)(35,44,45,48)(36,43,40,46)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.