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)(16,17)(18,20)(21,22,25,26)(23,29,31,27)(24,28,32,34)(30,36,33,35)(8,12)(10,11)(13,15,18,16)(14,19,20,17)(22,26)(24,32)(27,29)(30,33)(6,7)(10,11)(14,20)(15,16)(21,22)(23,27)(24,28)(25,26)(29,31)(30,35)(32,34)(33,36) involution — undirected(1,2)(3,4)(5,7,9,6)(8,11,12,10)(13,16,18,15)(14,19,20,17)(21,23,25,31)(22,27,26,29)(24,33,32,30)(28,36,34,35)(5,8,9,12)(6,10,7,11)(13,17,18,19)(14,15,20,16)(21,24,25,32)(22,28,26,34)(23,30,31,33)(27,35,29,36)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.