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