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