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