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