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