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