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