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