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