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