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