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