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