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