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