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