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