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