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