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