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