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