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