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