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