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