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