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)(17,18)(19,26)(20,31)(21,29)(22,28)(23,27)(24,25)(30,32)(1,3,5,8)(2,6,4,7)(9,10)(11,15)(12,14)(13,16)(17,19,22,25)(18,24,28,26)(20,29,32,27)(21,31,23,30)(1,4,5,2)(3,7,8,6)(9,11)(10,13)(12,16)(14,15)(17,20,23,24,22,32,21,26)(18,25,29,31,28,19,27,30)(3,8)(6,7)(11,16)(13,15)(17,19)(18,26)(20,29)(21,31)(22,25)(23,30)(24,28)(27,32) involution — undirected(10,14)(13,15)(17,21,22,23)(18,27,28,29)(19,30,25,31)(20,24,32,26)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.