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