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