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