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