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