One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,6)(5,8)(9,10,13,12)(11,15,16,14)(17,18,22,24)(19,20,26,23)(21,25,30,32)(27,28,29,31)(9,11,13,16)(10,14,12,15)(17,19,22,26)(18,23,24,20)(21,29,30,27)(25,28,32,31)(1,2,4,6)(3,5,8,7)(9,12,13,10)(11,15,16,14)(18,24)(19,26)(21,30)(28,31)(1,2)(3,5)(4,6)(7,8)(17,19)(18,23)(20,24)(21,27)(22,26)(25,31)(28,32)(29,30) involution — undirected(1,3,4,8)(2,5,6,7)(17,20,22,23)(18,19,24,26)(21,28,30,31)(25,27,32,29)(17,21,22,30)(18,25,24,32)(19,27,26,29)(20,28,23,31)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.