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