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