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