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