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