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