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)(17,18,24,32,23,28,22,27)(19,20,25,21,26,31,29,30)(9,10)(11,16)(12,14)(13,15)(17,19,23,26)(18,21,28,30)(20,27,31,32)(22,25,24,29)(1,3,5,4)(2,6,7,8)(9,11,12,15)(10,13,14,16)(17,20)(18,25)(19,27)(21,24)(22,30)(23,31)(26,32)(28,29)(10,14)(13,16)(17,21)(18,26)(19,28)(20,22)(23,30)(24,31)(25,27)(29,32) involution — undirected(1,4,5,3)(2,6,7,8)(17,22,23,24)(18,27,28,32)(19,25,26,29)(20,21,31,30)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.