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