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)(17,18,23,22)(19,24,28,32)(20,25,27,29)(21,30,31,26)(1,2)(3,6)(4,8)(5,7)(9,11)(10,13)(12,16)(14,15)(17,19,23,28)(18,24,22,32)(20,26,27,30)(21,29,31,25)(10,14)(13,15)(17,20)(18,25)(19,21)(22,29)(23,27)(24,30)(26,32)(28,31) involution — undirected(1,3,5,4)(2,6,7,8)(10,14)(13,15)(17,18,23,22)(19,24,28,32)(20,29,27,25)(21,26,31,30)(1,4,5,3)(2,6,7,8)(11,16)(13,15)(17,21)(18,26)(19,27)(20,28)(22,30)(23,31)(24,25)(29,32)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.