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