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