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