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