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