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