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