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