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