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