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