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