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