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