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