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