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