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