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