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