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