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