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