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