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