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