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