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