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)(17,18,23,28)(19,29,33,39)(20,34,36,41)(21,27,22,26)(24,32,40,30)(25,35,42,37)(31,45,46,38)(43,47,48,44)(2,6)(7,8)(9,10)(11,14)(12,13)(15,16)(19,30)(20,35)(21,22)(24,29)(25,41)(26,27)(32,33)(34,42)(36,37)(39,40)(43,48)(44,47) involution — undirected(1,3,5,4)(2,7,6,8)(10,13)(14,15)(17,19,21,30,23,33,22,32)(18,24,26,29,28,40,27,39)(20,31,37,44,36,46,35,47)(25,38,34,43,42,45,41,48)(9,11,12,16)(10,14,13,15)(17,20,21,37,23,36,22,35)(18,25,26,34,28,42,27,41)(19,31,30,44,33,46,32,47)(24,38,29,43,40,45,39,48)(1,4,5,3)(2,7,6,8)(20,36)(25,42)(31,46)(34,41)(35,37)(38,45)(43,48)(44,47)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.