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