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