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