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