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