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