One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(6,10)(8,11)(12,17)(13,18)(14,20)(16,19)(21,22,25,30,26,31,33,29)(23,32,24,27,34,36,35,28)(5,6,11,18,9,13,8,10)(7,14,19,17,15,12,16,20)(21,23,33,35,26,34,25,24)(22,27,30,36,31,28,29,32)(2,4)(5,7)(6,12)(8,16)(9,15)(10,17)(11,19)(13,14)(18,20) involution — undirected(7,15)(12,14)(16,19)(17,20)(21,24,25,34,26,35,33,23)(22,28,30,32,31,27,29,36)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.