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