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