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