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