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