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