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