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