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