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