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