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