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