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