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